Mat



FIG. 1 is a perspective view of a mat showing our new design;

FIG. 2 is a plan view thereof; and,

FIG. 3 is a cross-sectional view thereof, taken on line 3-3 of FIG. 2.

The bottom of the mat is unadorned and forms no portion of the claimed design. The broken line showing of the environment is for illustrative purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for a mat, as shown and described. 